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This website is maintained by Mike Beigel, the inventor of the original Mu-Tron™ III,

and a founder of Musitronics Corp. which produced the original Mu-Tron products.


For more information on the original products and company, see:

Mu-Tron III US patents

Endorsement by Stevie Wonder

Mu-Tron III system patent by Mike Beigel of Mu-FX

System Patent

Mu-Tron III design patent by Mike Beigel of Mu-FX

Design Patent

Stevie Wonder Mutron III endorsement ad 1973
Mu-Tron III advertisement 1973.

If you want the original sound and circuitry of the Mu-Tron III, please buy either a used vintage original Mu-Tron III (and NOT the so-called "Mu-Tron III plus" which is not a vintage original Mu-Tron III ). 

Better yet, get my new MU-FX TRU-TRON 3X which has new features and better specs and retains all of the Mu-Tron III mojo.

MU-FX TRU-TRON 3X by Mike Beigel inventor of the Mu-Tron 3


Please See our Facebook pages and make friends at: 

Mike Mu-Tron 

Musitronics Mu Tron 



Vintage Mu-Tron Products : The Inventors Collection!

Original prototypes and personal samples by Mike Beigel. All units are originals from my personal collection, none of which are second-hand, and all are calibrated. Pre-production prototypes and one-of-a-kind lab specimens are also in the collection. Also included is a substantial amount of documentation both on the company and the products.

The collection is not for sale, but some item may be rented for short-time studio use, or by museums for temporary display

Musitronics complete Mu-Tron product line developed by Mike Beigel
The Original Musitronics Mu-Tron Product Line

the inventors collection includes many other items.

Additionally, we still have a few original Musitronics units for sale:

Click to View!


And Others Articles by Mike Beigel about musical signal Processing

Check out these five articles linked from www.beigeltech.com

The stomping ground - history of mu-tron
The Stomping Ground: Musictronics, Mu-Tron, and the Gizmotron
Move Than You Ever Wanted To Know About Phasors
Move Than You Ever Wanted To Know About Phasors
The Envelope Controlled Filter - Mix Magazine
The Envelope Controlled Filter
Digital Phase Shifting MU-TRON MUSITRONICS  by Art Thompson Miller Freeman Books, 1997
Mu-Tron Musictronics

Jerry Garcia's Rig : An interactive page featuring Jerry Garcia's rig. Mouse overs display the different equipment.A photo of his 90's rack can be viewed here

of all the guestion we receive at MU_TRON.ORG,

The most frequestion is!: "How Can I Get Jerry's Sound?"

my usual answer is: "You would have to ask Jerry :-)"


Mu-Tron.org Product Links

Here are some of the many websites of relevance to the Mu-Tron and other Musitronics products. Harmony Central has a selection of users reviews of the Mu-Tron III, as well as reviews for

other Musitronics products.

Article: The Technology of Auto-Wahs / Envelope-Controlled Filters (PDF)
If you're the author, please contact us so that we can give you appropriate credit.

Another interesting site is DiscoFreq's Envelope Filter Site, which features information about a variety of envelope control filters, including many original Mu-Tron products as well as new Electro-Harmonix devices.

Wikipedia has a writeup on Mu-Tron: Mu-Tron Wikipedia


Mike Beigel's Websites:
Musitronics - brief summary of the full musitronics product line.
Beigel Sound Lab - information on the Beigel Sound Lab product.
Penguin Pix - personal collection of high resolution penguin photography.
Mu-FX - modern successor to the Musitronics product line.

Looking for the modern equivalent to the Mu-Tron III?

Go to MU-FX for my Tru-Tron 3X

A brief Mu-Tron history lesson..

Mu-Tron III

The Mu-Tron III by Musitronics Corp. first came out in 1972. Since 1996 the Q-Tron developed by Electro Harmonix has been the successor to the legacy which is the Mu-Tron. In early 1995 Mike Beigel was commissioned by Mike Mathews (owner of EHX) to reinvent the sound of Mu-Tron, today EHX still sells that sound as the Q-Tron.

Product Line

(Q-Tron, Q-Tron+, Micro Q-Tron, Sterio Polyphase, Bi-Filter, Enigma and Riddle)


1996 EHX Q-Tron

1998 EHX Q-Tron+

2000 EHX Mini Q-Tron
Click on the pictures below to see ads and reviews for the Q-Tron: "The Envelope, Please," reprinted from the March 1998 issue of Guitar World and "Get Down, Get Funky," reprinted from the January 1998 issue of Guitar Shop.

(click each to enlarge)

Lastly in 2004 EHX released the highly anticipated studio quality Bi-Filter with roots deeply connected to that of the 1979 Beigel Sound Lab Envelope Controlled Filter.

1979 BSL Envelope Controlled Filter

2004 EHX Bi-Filter

Be sure to click the links to these products for more detailed information. Sound clips are available featuring the products and your favorite artists!

Original Authorized Musitronics Mu-Tron Repairs and Mods:

Please contact us at [email protected] for expert servicing, calibration and modification of original Mu-Tron products. Mike's service specialist has worked extensively with Mike Beigel on Mu-Tron servicing and restoration of the

Inventors Collection of Mu-Tron products and prototypes.


Power Supply Power Supply for Musitronics Mu-Tron III

This a power adapter that substitutes for the PS-1 power supply used with the Mu-Tron III. This little power supply gives the same operating voltage as the PS-1. The price for one of these power supplies is $49 US Dollars. Shipping and handling.

      contact : [email protected]

To contact us directly regarding repairs, mods, and the power supply,         

please e-mail us at: repairs @ mu-tron . org


Contact / E-Mail : [email protected]  
©2014 Mike Beigel. All Rights Reserved.